The CMPS 2012 is comprised of 2,616 registered voters who self-identified as Black (n=804), Latino (n=934), or White (n=878). The GfK Group (GfK, formerly Knowledge Networks) conducted the survey. Pretests of the survey were conducted between November 8, 2012 and November 19, 2012 in both English and Spanish. A STATA dataset containing the pretest interviews was reviewed prior to the main sample launch. Because changes were made to the main survey as a result of the pretest, the pretest interviews were not included as part of the main survey dataset. The main survey was conducted between November 16, 2012 and November 26, 2012 in both English and Spanish. The survey examined individual’s experiences voting and attitudes about social and economic issues prominent in the 2012 election. The CMPS uses probability-based web panels designed to be representative of the United States instead of “opt-in” panels that include only individuals with Internet access who volunteer themselves for research. As a result, panel members come from listed and unlisted telephone numbers, telephone and non-telephone households, and cell phone only households, as well as households with and without Internet access, which creates a representative sample. Panel members are recruited through national random samples (both by telephone and mail). Households are provided with access to the Internet and a netbook computer, if needed. Otherwise, participants are rewarded with incentive points that are redeemable for cash. In an effort increase completion of the surveys, panel members can enter special raffles or can be entered into special sweepstakes with both cash rewards and other prizes to be won. The median completion time of the survey was 20 minutes and the completion rate was 56.3%. Respondents were considered qualified if they did not refuse more than 4 of the first 7 questions in the survey. Those who refused 4 or more of the first 7 questions were terminated from the survey. The qualification rate was 99.8%. To reduce the effects of any non-response and non-coverage bias in the overall panel membership, a post-stratification adjustment was applied based on demographic distributions from the most recent data from the Current Population Survey (CPS). An additional Spanish language adjustment was used based on the 2010 Pew Hispanic Center Survey (the most recent available published data at the time). Language usage adjustments allow for the correct proportional fitting of Spanish-speaking members relative to other English-speaking Hispanic and non-Hispanic panel members within Census regions. The CMPS includes 37 items dealing with sociopolitical attitudes, mobilization political activity, advertising exposure and neighborhood context as well as three embedded survey experiments. Additionally, there are 15 items that capture demographic information, including: age, ancestry, birthplace, education, ethnicity, Latin American racial descriptors, skin color, marital status, number in the household, religiosity, gender, sexual orientation, internet usage and residential context. In addition to the survey and demographic data, the 2012 CMPS also includes latitude and longitude values for each respondent. This allows for more nuanced modeling with regard to contextual variables at the tract, city, county, MSA Level, and Congressional district.